Which model and size is best for me?

I just sold my 13" mid-2010 Macbook Pro and thought it was great. I'm looking to buy a new machine, and am debating between the Macbook Air, the Macbook Pro, and the Macbook Pro with Retina.

I am a university student (finishing off my business degree now, then headed to law school). I have another 4-5 years of school. I do general things on my computer -- e-mail, web browsing, MS Office, research, etc. I don't really do any photo or video editing as of right now. I listen to music and watch movies/TV as well on my laptop.

I bring my laptop EVERYWHERE, so portability and long battery is big for me.

Which model and screen size do you think is best for my needs?

Mac

Follow this Question